AI agents for business finance: what they can and can't do
What AI agents can do in bookkeeping, close, collections and compliance today, where a person must stay in charge, and how to judge a product.
The short answer
Gross profit is sales minus the cost of the goods sold; net profit is what is left after every other cost of running the business (rent, salaries, power, transport, charges, depreciation, interest and tax) is also taken off. A shop can make a healthy gross profit and still record a net loss if those running costs are larger, which is why both figures need watching every month.
Many traders judge the month by the difference between what they paid for goods and what they sold them for. That is gross profit, and it is only the first line. The money you can actually take out, reinvest or use to repay a loan is net profit. The example below walks through a month for an illustrative provisions shop, line by line.
The two definitions
- Gross profit
- Sales − cost of goods sold. Cost of goods sold is opening stock + purchases (including transport in) − closing stock.
- Net profit
- Gross profit − operating expenses − interest − tax. Also called the bottom line.
Between the two sit all the costs that do not change directly with each item sold. They are the reason a busy shop can still be short of money.
A shop example, one month
Example only. A provisions shop with two staff, rented premises and a generator.
| Line | Amount | Note |
|---|---|---|
| Sales | ₦4,000,000 | All cash, transfer and POS takings |
| Cost of goods sold | (₦3,000,000) | Opening stock + purchases − closing stock |
| Gross profit | ₦1,000,000 | 25% gross margin |
| Rent (monthly share of annual rent) | (₦250,000) | ₦3,000,000 a year ÷ 12 |
| Salaries | (₦380,000) | Two staff |
| Diesel and electricity | (₦180,000) | Generator plus prepaid meter |
| Transport and deliveries | (₦60,000) | Not already included in stock cost |
| Bank and POS charges | (₦40,000) | From statements |
| Depreciation | (₦50,000) | Freezer, shelving, generator |
| Stock loss and expired goods | (₦70,000) | From the stock count |
| Operating profit | (₦30,000) | Before interest |
| Loan interest | (₦60,000) | On a stock loan |
| Net profit before tax | (₦90,000) | A loss |
Operating expenses total ₦1,030,000 and interest ₦60,000, so total costs below gross profit are ₦1,090,000, which is ₦90,000 more than the ₦1,000,000 gross profit. The shop sold ₦4 million of goods and lost money.
Why net profit can be negative
- Fixed costs do not shrink in a slow month. Rent, salaries and the generator run whether sales are ₦3 million or ₦5 million.
- Margin is too thin for the overheads. At 25%, every ₦1 of overhead needs ₦4 of sales to cover it.
- Hidden costs. Stock loss, expired goods and charges are easy to ignore until they are counted.
- Borrowing costs. Interest sits below operating profit and can turn a small profit into a loss.
- Depreciation. It is not cash this month, but the freezer will need replacing; ignoring it overstates profit.
What would fix this shop
Example only. Two changes together: raising the average gross margin from 25% to 27% through better buying and pricing on selected lines (gross profit becomes ₦1,080,000 on the same ₦4,000,000 sales), and cutting stock loss from ₦70,000 to ₦30,000 through stricter rotation. Total costs fall to ₦1,050,000, so net profit becomes ₦30,000. Small, but positive, and each further ₦100,000 of sales at 27% adds ₦27,000.
Other levers: renegotiate delivery costs, move generator hours to peak trading times, and check whether the stock loan is still needed. Use break-even analysis to see how much you must sell to cover fixed costs; in this example, ₦1,090,000 of costs at a 25% margin needs ₦4,360,000 of sales.
Where tax comes in
Tax is charged on taxable profit, not on sales or gross profit. PwC's Nigeria summary (reviewed May 2026) lists a 0% rate on profits for small companies, using thresholds of ₦100 million turnover and ₦250 million fixed assets, and notes that the page uses 'and' in one place and 'or' in another, so confirm the test with an adviser. This shop's annual turnover of about ₦48 million would be within the turnover figure. Larger companies pay at the rate set by law. Sole traders are taxed differently; see how sole traders pay tax. For tax, depreciation is replaced by capital allowances, as PwC's deductions summary explains, and bad debts incurred in trade are deductible.
Profit is not the same as cash
Even a positive net profit does not mean money in the bank. Profit counts sales when made, while cash arrives when customers pay; stock bought this month sits on the shelf as an asset, not an expense, until it sells; and loan repayments reduce cash without touching profit. A shop can show a net profit and still be unable to pay its supplier on Friday. Read the profit figures alongside a cash summary, as covered in cash flow for small businesses.
Steps to produce both figures each month
- Total sales from all channels and reconcile to bank and POS statements.
- Count closing stock and work out cost of goods sold.
- List every expense paid or owed for the month, including a monthly share of annual costs like rent.
- Add depreciation and any stock loss.
- Subtract to get gross profit, operating profit and net profit, and compare with last month.
For a regular pack built around these figures, see monthly management accounts.
Where Pryme fits
Running sales receipts and expenses through one Pryme Business Account keeps the charges, salaries and supplier payments in a single statement, and the Finance agent prepares summaries from it for you to approve.
Questions people ask
What is the difference between gross profit and net profit?
Gross profit is sales minus cost of goods sold. Net profit subtracts every other cost too: rent, salaries, power, charges, depreciation, interest and tax.
Can a business have gross profit but no net profit?
Yes. If overheads and interest are larger than gross profit, net profit is negative even though every item sold above its cost.
Is rent part of cost of goods sold?
No. Rent is an operating expense below gross profit. Cost of goods sold covers the goods themselves and getting them into the shop.
How do I calculate net profit for my shop?
Start with sales, subtract cost of goods sold to get gross profit, then subtract all operating expenses, interest and tax.
Sources
- PwC Worldwide Tax Summaries: Nigeria, corporate income determination (last reviewed 29 May 2026) · accessed Oct 2026
- PwC Worldwide Tax Summaries: Nigeria, corporate deductions (last reviewed 29 May 2026) · accessed Oct 2026
This article is general information, not financial, legal or tax advice. Products described are provided under the terms on this site and are subject to regulation and eligibility.